Marin Mersenne 2^P-1
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Finding World Record Primes Since 1996

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MnStatusDetails
3108613Factored
FactorDigitsBitsDate
619576339586400817376120232685.72018-08-24 14:01:08
ECM
DigitsB1Curves
255000015 / 280
Estimated T-Level: 20.3
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Christian R. SimmsD447CC54387070390
Verified (Factored)1999-05-30Alan LundD447CC543870703980679
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2018-08-24ATH3277ECCE0FFB811F171338753
Verified2018-08-25Martin Russell3277ECCE0FFB811F1207664753
P-1 factors
DateFactorB1B2
2018-08-24619576339586400817376120233000000100000000
History
DateUserTypeResult
2022-09-03JossNF-PM1
B1=1238782, B2=223284600
2022-01-06JossNF-PM1
B1=1238782, B2=116447100
2021-12-11JossNF
no factor from 2^68 to 2^69
2021-04-11JossNF
no factor from 2^67 to 2^68
2020-09-07JossNF-PM1
B1=472492, B2=6217226, E=6
2018-08-25Martin RussellC-PRP
M3108613/61957633958640081737612023 : 3277ECCE0FFB811F
PRP: Verified
PRP without proof (not generated)
2018-08-24ATHC-PRP
M3108613/61957633958640081737612023 : 3277ECCE0FFB811F
PRP: Verified
PRP without proof (not generated)
2018-08-24mikrF-PM1
Factor: 61957633958640081737612023 / (P-1, B1=3000000, B2=100000000, E=12)
2017-04-11Gordon SpenceNF
no factor from 2^66 to 2^67
2017-03-11JossNF-PM1
B1=269568, B2=2695680, E=6
2017-02-15JossNF-PM1
B1=224640, B2=2246400, E=6
2017-02-04JossNF-PM1
B1=187200
2017-01-19JossNF-PM1
B1=156000
2016-12-27JossNF-PM1
B1=120000
2016-08-30JossNF-PM1
B1=100000, B2=4250000, E=6
2015-06-11ThaNF
no factor from 2^65 to 2^66
2015-02-07VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-07VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2011-11-21markrNF
no factor from 2^61 to 2^62
2011-08-23Squeeky_SquirrelNF-PM1
B1=100000, B2=2125000, E=6
2009-07-03Carsten KossendeyNF-PM1
B1=15000, B2=180000
2009-02-13Sturle SundeNF
no factor from 2^60 to 2^61